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Additive/Subtractive Hybrid Manufacturing (ASHM) offers an opportunity for on-line detection due to its layer by layer processes. Eddy current detection (ECD) is a well-established non-destructive method for inspection of surface/subsurface defects in electrically conductive materials. The ECD-enabled ASHM is a promising manufacturing technology to fabricate the parts with good surface condition and material quality. However, edge effect, as an inherent characteristic of ECD, limits the industrial application of ECD. In this study, a specimen with subsurface defects located in the edge area is fabricated. The effects of the edge on ECD signals from subsurface defects are investigated. An effective scanning path is proposed to eliminate the edge effect. A Finite Element (FE) model of ECD is established to analyze the edge effect on ECD. This study provides guidance to determination of the ECD parameters.

Eddy current detection; Edge effect; Finite Element; Defects; Reactance